News96: Add Bitcoin Core #16528

Author: bitschmidty

_posts/en/newsletters/2020-05-06-newsletter.md

@@ -149,8 +149,22 @@ version 0.20.*
     option will give the new features six months to mature before
     their expected release.
 
-- [Bitcoin Core #18038][] P2P: Mempool tracks locally submitted
-  transactions to improve wallet privacy FIXME:bitschmidty
+- [Bitcoin Core #18038][] improves privacy when initially broadcasting a
+  transaction by reducing the frequency that a wallet will attempt to resend
+  from about 30 minutes to about once a day. Previously, an entity surveilling
+  the network could see multiple broadcasts of the same transaction during these
+  resend periods from the same node and conclude that wallet was the originator.
+  By reducing the frequency of resending attempts from the wallet, the
+  originator of the transaction has less chance of being identified.
+
+  To ensure new transactions reach the network even without frequent
+  indiscriminate rebroadcast by the wallet, this PR also adds a type of
+  "unbroadcast" transaction within the mempool. An unbroadcasted transaction is
+  one that has been submitted locally via the wallet or RPC but which hasn't
+  been deemed successfully broadcast to the network. Such unbroadcasted
+  transactions remain in the mempool and will be rebroadcast every 10-15 minutes
+  until the node receives a `getdata` P2P message for that transaction, which
+  acts as a heuristic for determining a successful initial broadcast.
 
 - [BIPs #893][] makes several changes to the [BIP340][] specification of
   [schnorr][topic schnorr signatures] pubkeys and signatures, with